How secure is this configuration?

I use an iPhone secured with a 20 character alphanumeric passcode.
For password management, I use a KeePass 2 (v4) database configured with Argon2id using the following settings:
Memory: 64 MB
Iterations: 4,080
Parallelism: 32
The KeePass database is protected by a password that is more than 50 characters long. In addition, opening the database requires a key file. I store the key file alongside the database file, but I also keep four additional decoy key files in the same location.
How secure is this overall setup? At what stage of quantum computing development should I begin to worry about its impact on this kind of security?